fix(bitap): respect minMatchCharLength in exact-match shortcut

[JSap0914]

Problem

The fast-path in BitapSearch.searchIn() for pattern === text (exact string equality) returned isMatch: true without checking minMatchCharLength. The non-exact bitap path enforces this option via convertMaskToIndices, but the shortcut bypassed it entirely.

Reproduction:

// Fuse.match
const r = Fuse.match('abc', 'abc', { minMatchCharLength: 5 })
console.log(r.isMatch) // BUG: true — 3 chars < minMatchCharLength 5

// Corpus search
const fuse = new Fuse(['abc', 'abcde12345'], { minMatchCharLength: 5 })
console.log(fuse.search('abc').map(r => r.item))
// BUG: ['abc'] — should be excluded (3 chars < 5)

Closes #831

Fix

Added a length guard in the exact-match branch of BitapSearch.searchIn():

if (text.length < this.options.minMatchCharLength) {
  return { isMatch: false, score: 1 }
}

This mirrors what convertMaskToIndices does in the non-exact path.

Verification

npx vitest run
# 374 passed (0 failed)
# 3 new tests added (2 Fuse.match + 1 corpus search); 0 existing tests modified

AI-assisted: this fix was developed with AI pair-programming support.

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[krisk]

Nice catch, and the diagnosis on #831 is right.

I can't merge it as-is though. The tests import from dist/, and the dist/ in this PR doesn't have the guard. The "remove committed dist build artifacts" commit rebuilt the bundle without the fix (it got smaller, not bigger), so dist/fuse.mjs still has the old exact-match branch. On a clean checkout the two new Fuse.match/search tests fail against that stale bundle, so the 374-passed result doesn't reproduce here.

I've landed the same guard on main in dbb98b6 with dist/ rebuilt, plus a couple extra cases (empty-string match, token-search path). Going to close this in favor of that, but the credit's yours.